/***************************************************************************
Atari GX2 hardware
*****************************************************************************
MO data has 12 bits total: MVID0-11
MVID9-11 form the priority
MVID0-9 form the color bits
PF data has 13 bits total: PF.VID0-12
PF.VID10-12 form the priority
PF.VID0-9 form the color bits
Upper bits come from the low 5 bits of the HSCROLL value in alpha RAM
Playfield bank comes from low 2 bits of the VSCROLL value in alpha RAM
For GX2, there are 4 bits of bank
****************************************************************************/
#include "driver.h"
#include "machine/atarigen.h"
#include "atarigx2.h"
/*************************************
*
* Globals we own
*
*************************************/
UINT16 atarigx2_playfield_base;
UINT16 atarigx2_motion_object_base;
UINT16 atarigx2_motion_object_mask;
/*************************************
*
* Statics
*
*************************************/
static UINT16 current_control;
static UINT8 playfield_tile_bank;
static UINT8 playfield_color_bank;
static UINT16 playfield_xscroll;
static UINT16 playfield_yscroll;
/*************************************
*
* Tilemap callbacks
*
*************************************/
static TILE_GET_INFO( get_alpha_tile_info )
{
UINT16 data = atarigen_alpha32[tile_index / 2] >> (16 * (~tile_index & 1));
int code = data & 0xfff;
int color = (data >> 12) & 0x0f;
int opaque = data & 0x8000;
SET_TILE_INFO(1, code, color, opaque ? TILE_FORCE_LAYER0 : 0);
}
static TILE_GET_INFO( get_playfield_tile_info )
{
UINT16 data = atarigen_playfield32[tile_index / 2] >> (16 * (~tile_index & 1));
int code = (playfield_tile_bank << 12) | (data & 0xfff);
int color = (atarigx2_playfield_base >> 5) + ((playfield_color_bank << 3) & 0x18) + ((data >> 12) & 7);
SET_TILE_INFO(0, code, color, (data >> 15) & 1);
tileinfo->category = (playfield_color_bank >> 2) & 7;
}
static TILEMAP_MAPPER( atarigx2_playfield_scan )
{
int bank = 1 - (col / (num_cols / 2));
return bank * (num_rows * num_cols / 2) + row * (num_cols / 2) + (col % (num_cols / 2));
}
/*************************************
*
* Video system start
*
*************************************/
VIDEO_START( atarigx2 )
{
static const struct atarirle_desc modesc =
{
REGION_GFX3,/* region where the GFX data lives */
256, /* number of entries in sprite RAM */
0, /* left clip coordinate */
0, /* right clip coordinate */
0x000, /* base palette entry */
0x400, /* maximum number of colors */
{{ 0x7fff,0,0,0,0,0,0,0 }}, /* mask for the code index */
{{ 0,0x03f0,0,0,0,0,0,0 }}, /* mask for the color */
{{ 0,0,0xffc0,0,0,0,0,0 }}, /* mask for the X position */
{{ 0,0,0,0xffc0,0,0,0,0 }}, /* mask for the Y position */
{{ 0,0,0,0,0xffff,0,0,0 }}, /* mask for the scale factor */
{{ 0x8000,0,0,0,0,0,0,0 }}, /* mask for the horizontal flip */
{{ 0,0,0,0,0,0,0x00ff,0 }}, /* mask for the order */
{{ 0,0x0e00,0,0,0,0,0,0 }}, /* mask for the priority */
{{ 0 }} /* mask for the VRAM target */
};
struct atarirle_desc adjusted_modesc = modesc;
int i;
/* blend the playfields and free the temporary one */
atarigen_blend_gfx(machine, 0, 2, 0x0f, 0x30);
/* initialize the playfield */
atarigen_playfield_tilemap = tilemap_create(get_playfield_tile_info, atarigx2_playfield_scan, TILEMAP_TYPE_PEN, 8,8, 128,64);
/* initialize the motion objects */
adjusted_modesc.palettebase = atarigx2_motion_object_base;
for (i = 0; i < 8; i++)
adjusted_modesc.colormask.data[i] &= atarigx2_motion_object_mask;
atarirle_init(0, &adjusted_modesc);
/* initialize the alphanumerics */
atarigen_alpha_tilemap = tilemap_create(get_alpha_tile_info, tilemap_scan_rows, TILEMAP_TYPE_PEN, 8,8, 64,32);
tilemap_set_transparent_pen(atarigen_alpha_tilemap, 0);
/* reset statics */
current_control = 0;
playfield_tile_bank = 0;
playfield_color_bank = 0;
playfield_xscroll = 0;
playfield_yscroll = 0;
}
/*************************************
*
* Periodic scanline updater
*
*************************************/
WRITE16_HANDLER( atarigx2_mo_control_w )
{
logerror("MOCONT = %d (scan = %d)\n", data, video_screen_get_vpos(0));
/* set the control value */
COMBINE_DATA(¤t_control);
}
void atarigx2_scanline_update(running_machine *machine, int scrnum, int scanline)
{
UINT32 *base = &atarigen_alpha32[(scanline / 8) * 32 + 24];
int i;
if (scanline == 0) logerror("-------\n");
/* keep in range */
if (base >= &atarigen_alpha32[0x400])
return;
/* update the playfield scrolls */
for (i = 0; i < 8; i++)
{
UINT32 word = *base++;
if (word & 0x80000000)
{
int newscroll = (word >> 21) & 0x3ff;
int newbank = (word >> 16) & 0x1f;
if (newscroll != playfield_xscroll)
{
video_screen_update_partial(0, scanline + i - 1);
tilemap_set_scrollx(atarigen_playfield_tilemap, 0, newscroll);
playfield_xscroll = newscroll;
}
if (newbank != playfield_color_bank)
{
video_screen_update_partial(0, scanline + i - 1);
tilemap_mark_all_tiles_dirty(atarigen_playfield_tilemap);
playfield_color_bank = newbank;
}
}
if (word & 0x00008000)
{
int newscroll = ((word >> 6) - (scanline + i)) & 0x1ff;
int newbank = word & 15;
if (newscroll != playfield_yscroll)
{
video_screen_update_partial(0, scanline + i - 1);
tilemap_set_scrolly(atarigen_playfield_tilemap, 0, newscroll);
playfield_yscroll = newscroll;
}
if (newbank != playfield_tile_bank)
{
video_screen_update_partial(0, scanline + i - 1);
tilemap_mark_all_tiles_dirty(atarigen_playfield_tilemap);
playfield_tile_bank = newbank;
}
}
}
}
/*************************************
*
* Main refresh
*
*************************************/
VIDEO_UPDATE( atarigx2 )
{
/* draw the playfield */
fillbitmap(priority_bitmap, 0, cliprect);
tilemap_draw(bitmap, cliprect, atarigen_playfield_tilemap, 0, 0);
tilemap_draw(bitmap, cliprect, atarigen_playfield_tilemap, 1, 1);
tilemap_draw(bitmap, cliprect, atarigen_playfield_tilemap, 2, 2);
tilemap_draw(bitmap, cliprect, atarigen_playfield_tilemap, 3, 3);
tilemap_draw(bitmap, cliprect, atarigen_playfield_tilemap, 4, 4);
tilemap_draw(bitmap, cliprect, atarigen_playfield_tilemap, 5, 5);
tilemap_draw(bitmap, cliprect, atarigen_playfield_tilemap, 6, 6);
tilemap_draw(bitmap, cliprect, atarigen_playfield_tilemap, 7, 7);
/* copy the motion objects on top */
{
mame_bitmap *mo_bitmap = atarirle_get_vram(0, 0);
int left = cliprect->min_x;
int top = cliprect->min_y;
int right = cliprect->max_x + 1;
int bottom = cliprect->max_y + 1;
int x, y;
/* now blend with the playfield */
for (y = top; y < bottom; y++)
{
UINT16 *pf = (UINT16 *)bitmap->base + y * bitmap->rowpixels;
UINT16 *mo = (UINT16 *)mo_bitmap->base + y * mo_bitmap->rowpixels;
UINT8 *pri = (UINT8 *)priority_bitmap->base + y * priority_bitmap->rowpixels;
for (x = left; x < right; x++)
if (mo[x] && (mo[x] >> ATARIRLE_PRIORITY_SHIFT) >= pri[x])
pf[x] = mo[x] & ATARIRLE_DATA_MASK;
}
}
/* add the alpha on top */
tilemap_draw(bitmap, cliprect, atarigen_alpha_tilemap, 0, 0);
return 0;
}